I bought these two packs in December 2020. I put the first one in my Dyson heat and cool unit in January and tagged the box to expect a change in July. (6 months). This device works 24/7 in the bedroom and the filter change icon only showed up on November 21st. So it took longer than I expected. When I removed the used filter I compared it to a Dyson filter I removed in January and the fouling pattern was the same. I don't know if I thought it was fake or a different color (different filtering?) but it looks exactly the same to me. I am satisfied and will order again what I need, maybe in June? I can't remember how long the original Dyson filters lasted, sorry so can't compare usage but $10 for 6+ months is good for me!
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